CVE-2026-23744 | REC in MCPJam inspector due to HTTP Endpoint exposes

Exp

MCPJam inspector is the local-first development platform for MCP servers. Versions 1.4.2 and earlier are vulnerable to remote code execution (RCE) vulnerability, which allows an attacker to send a crafted HTTP request that triggers the installation of an MCP server, leading to RCE. Since MCPJam inspector by default listens on 0.0.0.0 instead of 127.0.0.1, an attacker can trigger the RCE remotely via a simple HTTP request. Version 1.4.3 contains a patch.

Published: 2026-01-16 Last update: 2026-03-13 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-23744 is rated High Exploit Risk (90/100): CVSS Critical severity, with high exploitation likelihood (EPSS 36.13%, 98th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.40% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2026-23744

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-23744

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 34.72% 36.13% +1.40%
2 2026-06-14 28.06% 34.72% +6.66%
3 2026-06-11 — 28.06% —

Full EPSS history (26 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-23744

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2026-23744

GitHub Security Advisory for CVE-2026-23744

GHSA-232v-j27c-5pp6 · Severity: critical · Ecosystem: npm — REC in MCPJam inspector due to HTTP Endpoint exposes

Affected software / configurations for CVE-2026-23744

Vendor Product Version Raw CPE
mcpjam inspector < 1.4.3 cpe:2.3:a:mcpjam:inspector:*:*:*:*:*:*:*:*

References for CVE-2026-23744

cvelogic Threat Intelligence